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who knows these kind of bounds?

I am intensively thirsty to know them.

I found these two kinds of numbers are difficult to deal with. Because they are positive at some time and negative at other time. I am lost! Thank you all ,my friends!

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3 
If you are intensively thirsty, you should have an intensive cup of wikipedia. – Alex Bartel Nov 29 2010 at 9:39

closed as not a real question by Franz Lemmermeyer, Gjergji Zaimi, Andreas Thom, Daniel Moskovich, Gerry Myerson Nov 29 2010 at 12:03

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